In the test of USOC wiring configurations, which pair is the default pair that is ready to test?

The default pair that is ready to test in USOC wiring configurations is typically Pair 1, which consists of pins 4 and 5. This designation is significant because Pair 1 is traditionally associated with the primary signaling pair used for voice communications. In many telephone systems, this pair is utilized for the basic functionality of transmitting and receiving voice signals, making it the most commonly tested pair when verifying wiring configurations.

Understanding this context is essential for troubleshooting and setting up telecommunications systems effectively. The other pairs, while functional, often serve specific roles (such as secondary or redundant signaling) and are not the primary focus during initial testing or setup procedures. Thus, knowing that Pair 1 is the default pair helps technicians quickly identify the correct wiring to interface with standard telecommunications equipment.